$18x^5+30x^4$
$-7+16r=57$
$2\sqrt{\infty+1}$
$a^2+4a$
$\frac{d}{dx}x^{\frac{1}{7}x}$
$\frac{x^9y^8}{x^7y^4}$
$\left(7x^4-6x^2+3\right)\:x\:\left(2x+x^3\right)$
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